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Forum index » Science and Technology » Chem » Electrochem
Please tell me What I know it's Correct or not???(about EIS)
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EIS_MAN1984
science forum beginner


Joined: 30 Jun 2006
Posts: 1

PostPosted: Fri Jun 30, 2006 6:32 pm    Post subject: Please tell me What I know it's Correct or not???(about EIS) Reply with quote
I am new in EIS and I am studying about lacquer coated (two
lacquer----> Primer and Top)Aluminium.
Please tell me What I know it's Correct or not???
Please Click This Link!!!
http://www.geocities.com/eis_man1984/scan0001.jpg

Thank you very much
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bob.rodgers@consultrsr.co
science forum beginner


Joined: 25 Feb 2005
Posts: 2

PostPosted: Wed Jul 05, 2006 3:56 pm    Post subject: Re: Please tell me What I know it's Correct or not???(about EIS) Reply with quote
EIS_MAN1984 wrote:
Quote:
I am new in EIS and I am studying about lacquer coated (two
lacquer----> Primer and Top)Aluminium.

I would be surprised if you can actually seperate the two layers by EIS
of the coating is a good barrier coating. Even if you could, I would
not expect the four time-constants in your model.

I would estimate the capacitance of your coating (~ Cc in your model )
and measure a true capacitor under the same conditions. I suspect an
instrumental artifact due to changing the current scale as the
frequency changes. The stray capacitance of the cell leads and/or I/E
converter causes a drop in the phase every time the current range is
changed. Most of the commercial software for obtaining the EIS spectrum
with a computer controlled potentiostat is smart enough to correct for,
or avoid, this effect. If this artifact is the cause of your spectrum,
then you should see the same sort of effect on a true capacitor.

This artifact is described in an application note from Ametek
"Corrections for Potentiostat Response (Tech. Note 201)"

Regards,
Bob Rodgers
brodgers at Gamry.com
bob.rodgers at ConsultRSR.com
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